Circuit arrangement for determining differences in capacitance

Details Circuit arrangement for determining differences in capacitance Circuit arrangement for determining differences in capacitance

1996-04-04

1997-05-13

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324665, 324678, 7351432, 73718, G01R 2726

Patent

active

056296290

ABSTRACT:
In a circuit arrangement for determining differences in capacitance, two capacitors (1,2) are alternately connected to an integrator with differential amplifier (3) whose input current is positive (+I) when the first capacitor (1) is integrated or negative (-I) when the second capacitor (2) is integrated, whereby the switches (5,6,7) are synchronously switched. The differential amplifier keeps the voltages at the two capacitors the same. A clocked control device (4) controls the synchronous switching and separately measures and adds the respective charging and discharging times and, as warranted, measures and adds the output voltage of the integrator and controls the last charging cycle such that the voltage at the capacitors is subsequently equal to the initial voltage. The relative or absolute differences in capacitance are calculated from the identified sums and can be digitally output.

REFERENCES:
patent: 4392378 (1983-07-01), Pitches et al.
patent: 4736629 (1988-04-01), Cole
patent: 5028876 (1991-07-01), Cadwell
patent: 5122755 (1992-06-01), Nootbaar et al.
patent: 5194819 (1993-03-01), Briefer
patent: 5299460 (1994-04-01), Schultz et al.
patent: 5428352 (1995-06-01), Bennett

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